package com.zhang.hadoop.netty.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @author: zhang yufei
 * @create: 2022-01-22 16:20
 * @description: 1.SimpleChannelInBoundHandler是ChannelInboundHandlerAdapter
 * 2.HttpObject客户端和服务器段相互通讯的数据被封装成HttpObject
 **/
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    //channelRead0读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {
        //判断msg是不是HttpRequest请求
        if (httpObject instanceof HttpRequest) {
            System.out.println("pipeline hashcode:" + channelHandlerContext.pipeline().hashCode() +
                    "TestHttpServerHandler hashcode:" + this.hashCode());
            System.out.println("msg 类型=" + httpObject.getClass());
            System.out.println("客户端地址" + channelHandlerContext.channel().remoteAddress());

            //特定资源进行过滤

            //获取
            HttpRequest httpRequest = (HttpRequest) httpObject;
            //获取到uri
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico,不做响应");
                return;
            }

            //回复信息给浏览器【http协议】
            ByteBuf content = Unpooled.copiedBuffer("hello，我是服务器", CharsetUtil.UTF_8);
            //狗仔一个http的响应，即HttpResponse
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
            //将构建好的response返回
            channelHandlerContext.writeAndFlush(response);
        }
    }
}
